Biodemography and Social Biology最新文献

Stunting and wasting are major public health challenges in India, contributing to high child morbidity and mortality. Beyond inadequate nutrition, poor access to water, sanitation, and hygiene (WASH) is increasingly recognized as a key risk factor. This study assessed the association between household WASH access and undernutrition among children under five years. We analyzed data on 143,467 under-5 children from the National Family Health Survey (2019-21). Undernutrition was defined using WHO growth standards for stunting, wasting, and underweight. Household WASH access was defined as improved drinking water, improved sanitation, and a handwashing facility. Kernel-based propensity score matching (PSM) estimated the average treatment effect on the treated (ATT). Undernutrition was consistently higher among children without WASH access (stunting 37% vs. 31%; wasting 19% vs. 17%; underweight 30% vs. 24%). After PSM, WASH access was significantly associated with reduced prevalence of stunting (ATT = -0.009, p < 0.05) and underweight (ATT = -0.008, p < 0.05), but not wasting. The protective effects were stronger among urban, wealthier households and female children, with no significant associations in rural or poorest households. Improved WASH access is modestly associated with lower stunting and underweight, highlighting the importance of equity-focused interventions.

This study aims to investigate the age and sex-related variations in somatotype among older adults in Türkiye using the Heath-Carter method. Anthropometric measurements were taken from 2128 participants (1,009 males and 1119 females) aged 65 and over, selected through stratified sampling from the seven regions of Türkiye. The findings indicated that the most prevalent somatotype in both sexes was Endo-Mesomorph, accounting for 50% of males and 58.1% of females. With advancing age, a decrease was observed in body weight, height, Body Mass Index (BMI), and body fat percentage in both sexes. Age-related remodeling of body composition was further reflected in somatotype patterns: while endomorphy declined in males, both endomorphy and mesomorphy decreased progressively in females. Across all age groups, mesomorphy remained more dominant than endomorphy, suggesting relative preservation of muscularity. In conclusion, this study demonstrates that the Endo-Mesomorph somatotype is predominant among older adults in Türkiye, with notable age- and sex-related differences: age-related changes include a decline in endomorphy in males, while both endomorphy and mesomorphy decrease in females. These results offer new evidence from a large Turkish cohort and align with international findings on age-related body composition remodeling, supporting the development of tailored, culturally relevant interventions for healthy aging.

The variation in age-specific death probability is closely linked to demographic, socioeconomic, and geographical factors. The present study employs a functional neural network regression model to examine the influence of these factors on regional death patterns in China, with a specific focus on individuals aged 40 and above, from a nonlinear perspective. In comparison with conventional linear models, this approach is shown to more effectively capture the intricate relationships present in death patterns, thereby enhancing both the predictive performance and the interpretability of the results. Key findings include: (1) Fifteen key factors influencing regional death patterns are identified, with gender and urban-rural status emerging as the most significant. (2) Educational level has a significant impact on death probability in the 40-44 age group. After the age of 45, probabilities are increasingly affected by climate and economic conditions, while healthcare becomes crucial for those aged 60 and above. (3) Some factors exert different levels of influence on death probability across age groups. (4) Interactions between factors, particularly between urban-rural status and other factors, affect model outputs.

Despite preventing cardiovascular events, adherence to the Mediterranean Diet (MedDiet) is declining globally. This study assessed adherence to the MedDiet and its association with material, social, and health-related deprivation among patients with cardiovascular conditions. Data from 328 patients in a southern Turkish city between December 2022 and August 2023 were collected using a Personal Information Form, the Mediterranean Diet Adherence Scale, and the Deprivation Questionnaire, and analyzed using logistic regression and decision tree analysis. Participants' mean age was 64.0 ± 10.2 years, and 50.6% were women. The mean MedDiet adherence score was 6.37 ± 2.54 (range: 1-12). Longer disease duration was associated with higher adherence in stroke, heart failure, and coronary artery disease, but not hypertension. Male gender (OR = 3.556, 95% CI 2.107-6.000) increased the odds of low MedDiet adherence, whereas older age (OR = 0.957, 95% CI 0.933-0.982) and active effort to follow the diet (OR = 0.538, 95% CI 0.405-0.714) decreased the odds. Decision tree analysis highlighted deprivation as a key factor, with gender and rural residence contributing to disparities. Overall, adherence remains suboptimal, particularly for fish, nuts, and olive oil. Deprived individuals, especially men and rural women, need targeted interventions and policies support for dietary access and secondary prevention.

This article examines birth seasonality in Puerto Rico and explores whether patterns shift during periods of economic transformation. We compiled monthly birth counts for approximately 5.64 million births occurring from 1935 to 2024. Data sources include reports to U.S. agencies (1935-1966), a prior publication (1967-1971), and the Puerto Rico Vital Statistics System (1972-2024). To assess the temporal concentration, we calculated a seasonal index of births and modeled 5-year patterns with LOESS curves. We identified four distinct seasonal patterns. From 1943 to 1949, births peaked in April - May. Between 1950 and 1954, this peak declined as a new one emerged from August to October. Beginning in 1955, a third pattern appeared, with fewer births early in the year and a peak in the second half. This pattern remained stable until about 2010. After 2010, we observe (1) a narrowing of early-year minimums, (2) increased within-period variability, and (3) a decline in December, though (4) the August to November peak persists. These changes align with economic transitions that occurred under US occupation, bringing forth the need to reexamine the hypothesis of cultural or media influence in future studies. Given observed patterns, future research should explore the role that economic shifts may have in shaping birth seasonality in Puerto Rico.

Bangladesh experiences frequent extreme weather events (EWEs) that are associated with various dimensions of human life, including fertility preferences. This study examines associations among EWEs, family structure (nuclear vs. joint families), and fertility preferences in two climatically distinct regions of Bangladesh. The research was conducted in Chattogram district (cyclone-exposed) and Sunamganj district (flood-exposed), with two villages selected from each district based on high vulnerability to their respective EWEs. Data were collected through structured questionnaires administered to 414 married women of reproductive age (15-49 years) with at least one child, supplemented by 17 in-depth interviews exploring underlying motivations and experiences. Results show significant differences in fertility preferences between nuclear and joint family structures across both climate-vulnerable areas. Women in nuclear families expressed higher fertility preferences compared to those in joint families, with this pattern more pronounced in flood-exposed area (Sunamganj) than cyclone-exposed area (Chattogram). Qualitative findings indicate that family structure shows relationships with adaptive strategies for EWEs. Multiple factors appeared linked to fertility preferences across different family types, including perceived advantages of larger families for disaster coping, intergenerational support systems, spatial constraints, availability of adult male members, contraceptive use, and access to government/NGO assistance. These findings suggest that family structure represents an important but underexplored variable in understanding climate-fertility associations in vulnerable regions.

Objectives: To analyze the inequalities of population aging in Brazil by a new measure - relative age combined with characteristics approach.

Methods: Data from the 2015-2016 Brazilian Longitudinal Study of Aging (ELSI-Brazil) were analyzed. Population subgroups over 50 years old had their relative ages calculated, considering schooling level and self-reported skin color/race. Handgrip strength was employed as a physical health indicator.

Results: Results show that Brazilians of the same birth cohort can have more than 10 years of difference between their relative ages. Depending on the schooling level, Brazilians can present characteristics of people 10 years younger (or older) compared with those in the same chronological age. Males who declared themselves Brown have their relative ages up to 4.9 years higher compared with those in the same chronological age and White.

Work disability has become a global public health problem and places a considerable burden on individuals and families. This paper uses data from the China Labor-force Dynamic Survey to investigate the impact of husband's work disability on wife's employment decisions in rural areas of China. Estimation results do not indicate a disability-related added worker effect but show a significant caregiver effect; wives of disabled husbands experience a reduction in the likelihood of employment participation. Results also show that a husband's work disability leads to a lower likelihood that the wife will engage in self-employment rather than wage employment. This may be because the flexibility of self-employment helps women to adjust their labor patterns to care for disabled husbands. The mechanism analysis demonstrates that the disability of husbands does lead to a greater likelihood that the wife will provide more care to the family while at the same time, increasing the household health expenditure.

Fertility policy directly affects the fertility decisions of residents' families, and has the greatest impact on the daily lives of China's residents and on the country's economic and social development. In recent years, as the demographic situation has changed, China's fertility policy has undergone a series of adjustments, and the government has implemented different incentives in the legal system, child care, education, and maternity insurance to stimulate fertility intention. This is a major shift in China's fertility policy from "family planning" to "fertility support." In the process of policy adjustment, a series of problems emerged. First, the continuous adjustment of the fertility policy causes information gaps among departments at different levels, thus leading to coordination difficulties and a lack of responsibility between the upper and lower levels of policy implementation. Second, the implementation of the two-child policy is ineffective, and its incentive effect fails to meet the expected standard. Therefore, this paper explores the similarities and policy effectiveness of fertility policies and uses the LDA thematic clustering model, cosine similarity distance algorithm, and PMC index evaluation system to quantitatively analyze fertility policies in different periods. The results are as follows: (1) due to changes in China's demographic structure, China's fertility policy has adjusted significantly during the universal two-child period, and its policy content and specific measures have changed dramatically compared with those of the previous period, while China's fertility policy has stabilized during the universal three-child period. (2) In the policy effectiveness evaluation, most policies have undetailed long-, medium-, and short-term goals and lack adequate policy guarantees. Therefore, to build a perfect fertility support system, the government needs to comprehensively consider the synergy of policy measures, the strengthening of policy guarantee programs, and the enhancement of policy effectiveness in the formulation of relevant policies, to continuously make policies more targeted, scientific, and effective.

Biological age acceleration predicts multiple "diseases of aging." Objective and subjective social statuses have both been prospectively linked to this outcome. An established chain-of-risk framework suggests that "effects" of each may be mediated by one's subsequent structural position. A separate deaths-of-despair literature identifies a person's sense of futility as another potential link. Such chains remain underexplored. The current study used data from three waves (2008-2016) of the Health and Retirement Study (HRS) to fill these gaps. The analysis was done through a counterfactual regression-with-residuals (RWR) approach. Asimulated decline in a person's objective but not subjective status predicted their age acceleration 8 years later. Contrary to chain-of-risk conceptions, intermediate social standing did not channel effects. Neither did despair. Findings were more consistent with a direct "material shocks" explanation for status-aging linkages than an indirect or psychosocial one. Implications for aging theory and for interventions are discussed.